Good program. use it all the time. When iMovie is on, goto file, then delete (on the bottom). Also do a spotlight search of the name you gave your project to see if there are any associate files. I have tiger on another mac so will fire that up to see where else to look. I'll post more if I find something. BTW, iMovie 6 does work in leopard.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.